Figures

Overall in-plane strain εyy=ε⁁yy(×100) is the same in the metal and the oxide due to displacement continuity (Eq. (1)). After the first few days, accounting for the additional oxide strain due to prior creep (III) gives rise to significantly larger total strain than either an elastic analysis (I) or the primitive analysis that neglects prior creep (II). In particular, the total strain under (III) is not bounded by the value αy=0.003, the asymptote for (I) and (II).

Creep allows the stress in the metal σyy to relax from that predicted by a pure elastic analysis (I). Accounting for oxide strain magnification due to prior creep (III) gives higher stress than an analysis that ignores this effect (II).

Variation of the oxide stress σ⁁yy through the oxide thickness as the oxide layer progresses into the base metal. Different curves represent different five day intervals, ranging from t=5 to t=60. Graph on right provides magnification near the external surface, x=0.0635.

Once shedding begins at tff the strain increases dramatically (IV) compared to a situation in which oxide under tension does not fail (III). This strain increase for (IV) is due to the loss of tensile load carrying capacity in the oxide, which increases the tensile stress in the metal as shown in Fig. 5.

In this example, oxide shedding begins after stress relaxation has already begun in the metal. Shedding leads to additional loading of the metal, and the post-shedding stress experiences a mild increase with time.

Return to: On Corrosion-Induced Creep and the Shedding of Oxide Pest From Metal Plates

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